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physics.fisikastudycenter.com, Olympiads problem series, for beginner level. Problem number 15. Basic concepts: Inertia, circular motion, angular velocity, conservation of energy.

Problem 15
PQ is a uniform rod with mass of M and length of L at rest. PQ could freely rotate at P as a pivot.

If the rod then is released and starts to rotate, find the angular velocity of the rod when reaches the floor, show the answer in ω, g, dan L, where ω is the angular velocity of the rod, and g is the acceleration due to gravity.
Problem source: Rotasi benda tegar, Seri Buku Schaum

A homogeneous solid cylinder named A, with mass m1 is freely to rotate in it's axis. The cylinder is connected to block B with mass m2 See the figure.

Constant force F applied to the end of the string that is wrapped around the cylinder. Ignore all possible frictional forces, find:
(a) the acceleration of the rope end
(b) kinetic energi after t sec
Source of problem: Mekanika 1-Prof Yohanes Surya

Physics.fisikastudycenter.com, Physics Olympiads problem series, olympiads preparation for beginner level, high school level. The needed basic concepts for this problems are forces (weight, frictional force, string tension), Newton's Laws.

Problem 13
Given three masses: mA = 40 kg, mB, dan mC = 50 kg. The static frictional force coefficient between A and B is 0.3, between A the table is 0,2. See the figure!

Calculate the minimum mass of B so the system remains rest!
Question source: Fisika Study Center-Modification of UMPTN 1994 / Indonesian colleges examination entrance

Physics.fisikastudycenter.com, olympiad problems series, high school olympiads preparation, for beginner level, forces and newton's laws.

Problem 12
A mechanical system consisting of four masses m1, m2, m3 and m4. See the figure.

A horizontal force F is now applied to cart m4 as shown. The size of F is such that m1, m2 and m3 remain at rest relative to m4. Ignore the mass and frictional forces of string and pulley, find the magnitude of F and the system acceleration ! Use g = 10 m/s2 and the four masses respectively are 0,3 kg, 0,4 kg, 0,5 kg and 2,8 kg!
Problem source: Fisika Study Center-Modification of 3rd International Physics Olympiad 1969, Brno, Czechoslovakia, Problem 1

Physics.fisikastudycenter.com,- Olympiads problem serie, Physics olympiads preparation for beginners, high school students level,Problem # 11, the needed basic concepts in this problem are forces (weight, string tension, rope tension) and Newton's laws.

Problem 11
Two block, m1 dan m2 of 6 kg and 4 kg respectively in a pulleys systems. See the figure.

Use the acceleration due to gravity g = 10 m/s2, find the accelerations of m1 and m2 , ignore the mass of pulleys and assume there is no frictional force acting between the string/rope and the pulleys!

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